退火处理对粉末床熔融Ti6Al4V合金腐蚀磨损性能的影响  

Effect of annealing treatment on tribo-corrosion properties of Ti6Al4V alloy prepared by powder bed fusion

作　　者：张珊珊 刘元才[1] 徐铁伟 杨发展 ZHANG Shan-shan;LIU Yuan-cai;XU Tie-wei;YANG Fa-zhan(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China;Key Laboratory of Industrial Fluid Energy Conservation and Pollution Control,Qingdao 266520,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520 [2]工业流体节能与污染控制教育部重点实验室,山东青岛266520

出　　处：《材料热处理学报》2024年第11期101-110,共10页Transactions of Materials and Heat Treatment

基　　金：山东省自然科学基金面上项目(ZR2024ME184,ZR2020ME006);山东省重点研发计划项目(2018GGX102027)。

摘　　要：研究了退火处理对粉末床熔融(Powder bed fusion,PBF)制备的Ti6Al4V合金在腐蚀环境中摩擦磨损行为的影响,由微观组织结构中α/α′相形貌及含量入手,分析造成PBF-Ti6Al4V合金力学性能和耐腐蚀磨损性能差异的机理。结果表明:相同热处理工艺下合金平行成型方向的强度和硬度高于垂直成型方向,随退火温度的升高,PBF成型内应力减小,相尺寸增大,合金的强度和硬度有所下降,且垂直和平行成型方向的差异减小。PBF-Ti6Al4V合金在Hanks体液中的磨损机制主要为磨粒磨损和粘附磨损。800℃退火处理的合金具有最佳的综合性能,XY面和XZ面摩擦腐蚀电流分别为4.04×10^(-7)和2.77×10^(-7)A/cm^(2),磨损量分别为21.97和19.99μm^(3)。Effect of annealing treatment on friction and wear behavior of Ti6Al4V alloy prepared by powder bed fusion(PBF)in corrosive environment was studied.Starting from the morphology and content ofα/α′phase in the microstructure,the mechanism causing the differences in mechanical properties and corrosion wear resistance of the PBF-Ti6Al4V alloy was analyzed.The results show that under the same heat treatment process,the strength and hardness of the alloy in the parallel build direction(BD)are higher than those in the vertical build direction.With the increase of annealing temperature,the internal stress in PBF forming decreases,the phase size increases,the strength and hardness of the alloy decrease,and the difference between the vertical and parallel build direction decreases.The wear mechanism of the PBF-Ti6Al4V alloy in Hanks solution is mainly abrasive wear and adhesive wear.The alloy annealed at 800℃has the best comprehensive performance,with friction corrosion currents of 4.04×10^(-7)A/cm^(2)and 2.77×10^(-7)A/cm^(2)for XY and XZ planes,respectively,and wear losses of 21.97μm^(3)and 19.99μm^(3),respectively.

关 键 词：钛合金 粉末床熔融 各向异性 摩擦磨损 

分 类 号：TG146.2[一般工业技术—材料科学与工程]